A bunch of transmit requests received by the Uplink server (nic_router)
are currently added one by one to the ring buffer and every time the hardware
is notified to process each single request.
Instead, add as many as possible transmit requests in the ring buffer of
the hardware and when done trigger the hardware to process the ring.
Additionally, don't receive an "processed" TX IRQ for each element in the
ring, which causes high CPU load.
With this commit the TX IRQs in the ipxe driver for a
iperf -c X.X.X.X -t 60
from within a VM to the outside iperf server is reduced from about
~2'600'000 IRQs to about ~200'000. The overall CPU load for the driver
(when executed alone on CPU 0) is reduced from ~85 percent load to ~45 percent
load.
Issue #5149
Unregister callbacks, so rx packets will not be propated to the deleteted
'Driver' object. Initialize ipxe once in the 'Main' object, thus allowing new
session connections.
Fixes#1595
A long long time ago, in a galaxy^W^W^W we used DDE kit to ease the
porting of purely C based drivers. By now it became clear, that we
do not gain that much by following this approach. DDE kit contains
much generic functionality, which is not used or rather not needed
by most ported drivers. Hence, we implement a slim C wrapper on top
of Genode's C++ APIs, that is especially tailored to the driver.
In addition to removing the dependency on DDE kit, the iPXE driver
now uses the server framework and the newly introduced signal based
IRQ handling.
Issue #1456.
A Nic::Session client can install a signal handler that is used to
propagate changes of the link-state by calling 'link_state_sigh()'.
The actual link state is queried via 'link_state()'.
The nic-driver interface now provides a Driver_notification callback,
which is used to forward link-state changes from the driver to the
Nic::Session_component.
The following drivers now provide real link state: dde_ipxe, nic_bridge,
and usb_drv. Currently, OpenVPN, Linux nic_drv, and lan9118 do not
support link state and always report link up.
Fixes#1327
This patch changes the top-level directory layout as a preparatory
step for improving the tools for managing 3rd-party source codes.
The rationale is described in the issue referenced below.
Issue #1082
